Holder for dentists&#39; drilling instruments



"June 19, 1928.

V v H. STARK Roman FOR nsm'sws"" nmmnnmmm Filed Dec. 5, 1926 PatentedJune 19, 1928. v

UNITED, STATES 1,674,486 P E T" OFFICE- nANs STARK, or' nnnmsnonr, NEARBERLIN, GERMANY, assrcivon To nnorscnn GOLID- UNI) SILBER-SCHEIDEANSTALTVORMALS ROESSLERYOF rnmvxronnmm THE-MAIN, GERMANY, A CORPORATION orGERMANY.

HOLDER FOR DENTISTS DRI ELLING INSTRUMENTS.

Application filed December 3, 1926. Serial No. 152,350.

My invention relates to a holder for dental drilling instruments and thelik Th i vention consists in providing a setting device, by a simpleshifting of which in the axial direction of the holder, themovement ofthe spindle can be braked or released, and by which also the replacingof the drill holder shank is rendered possible.

The setting member may comprise, for instance a ring sliding on thegrinding handle or longitudinally adjustable thereon and which acts onparts contained within the sleeve of the holder, such as for instancethe driving spindle andthe tool holder, by means of extensions whichproject throughv an elongated slot in the sleeve of the grinding handleinto the interior, and there act on setting rings adjustable in theaxial direction, preferably supported by springs and connected to thespindle or to the tool driver. The arrangement may be made for instance,in such a manner that when the setting part or member is moved to theextent of half the length of the slot, the driving spindle proper willbe stopped, whilst 'When the setting ring is pulled to the extent of thewhole length of the slot, it will be possible to introduce or disconnectthe grinding tools. I

The holderproper for the grinding tools may be at the same time madeinto a detachable reducing head.

A construction according to the invention is shown by way of example inthe accompanying drawing in section.

Figure 1 is a cross section of the holder containing the driving spindleand show-' ing the features of my invention. Figure 2 is a detachablereducing head adapted to fit into the driving spindle in the holder.

In detail, the holder is constituted by a sleeve a in which rotates thedriving spindle b which is provided with two elongated slots 0 and d. Inthe bore 6 of the driving spindle is longitudinally adjustable a driver7 which is preferably supported by means of the spring 9. On the drivingspindle is also mounted in a'longitudinally adjustable manner, in anannular intermediate space 71. between the sleeve on and the drivingspindle b, a setting ring 2' which is connected to the driver f, forinstance by means of a pin j passing through a slot 0. In theintermediate space ]2. is further arranged, also in a longitudinallyadjustable manner, a

second setting ring 70 which is provided with a projection or pin Lpassing through the slot d of the spindle, and carries at its upper edgeteeth m. The setting ring is is provided with a spring suspension orsupport a. On the outside on the sleeve a is mountedthe outer push part0 from which projections, for instance, set screws 1 and.

g, project through recesses a of the sleeve a into the intermediatespace 7L.

Figure2 shows the reducing head withdrawn from the holder, the shanks sof which is given a shape corresponding to that of the driver 7 andwhich is connected to the driving spindle b for instance, by means of apin t. In the upper part of the reducing head Q; is fixed a clampingsleeve u I with a screw 'w provided With inner threads.

The manipulation of the holder, for instance, when replacing a grindingor a drilling tool, is as follows:

' The outer push part 0 is pulled down in the given direction away fromthe holder shoulder. The set screw of the projection 32 then presses theinner setting ring 'i'towards the setting ring 71. I When the ring 0 hasbeen pulled, to the extent ofhalf the length of the slot, the set screw9 engages with the teeth m of the inner setting ring is and produces thestopping of the driving spindle I). During further pulling down of theouter push part 0 to the extent of the whole length of the slot, thedriver f which is connected by the pin j to the setting'ring '2', ispressed against the spring 9, so that the reducing head 8 is released,and the-reducing head can be withdrawn from the sleeve.

The construction of the holder according to the invention can be variedin many ways without departing from the invention.

Owing to the movement of the setting member in the holder according tothe invention taking place, both for the driving of the spindle and forthe replacing on the tool, in one direction only, namely in the axialdirection, the advantage is obtained that the dentist can work theholder conveniently with one hand. If, for instance, one manipulationwere to require a longitudinal movement, and the other a rotation of thesetting member, the manipulation would require the co-operation of thesecond hand, as it would be impossible, or only possible With greatdifficulty, to effect this rotation after, for instance, the thumb hasbeen bent for effecting the longitudinal movement.

What I claim is 1. In a dentists drilling instrument holder having acasing With a driving spindle therein, the combination of a means forexerting a braking action on said spindle, means for engaging tools ortool holders in said spindle, and a sleeve means about said casing foroperating said braking means and tool engaging means by simplelongitudinal motion of said sleeve.

2. In a dentists drilling instrument holder having a casingWith adriving spindle therein, the combination of tool engaging device in saidspindle, a loose ring about said spindle inside said casing andconnected to said tool engaging device by means of a pin through anelongated slot in said spindle a longitudinally movable sleeve aboutsaid casing acting on said ring through a slot in said-spindle, alongitudinally movable sleeve about said casing acting on said ringsthrough slots in said casing to exert a braking action on said secondring and to engage or disengage tools from said holder by action on saidfirst ring.

Signed at Berlin, Brandenburg, Prussia this 13th day oi? November A. D.1926.

HANS STARK.

